该数据集为奈曼（P121R030）、敦煌（P137R032）、民勤（P131R033）县域所在Landsat卫星轨道号的图像上选定125*125km2范围作为典型区，以Landsat系列卫星图像作为数据源，采用面向对象的分类方法结合1:10万比例尺成图要求，对1975-2024年六期荒漠化进行专题制图。数据格式为Shape file，投影系统采用基于 WGS84 基准的 ALBERS 等面积投影。属性表中Class_name字段为荒漠化编码。", "ds_source": "
以Landsat系列卫星影像为数据源，其中1975年采用MSS影像，1990年、2000年、2010年采用TM影像，2020年和2024年采用OLI影像。", "ds_process_way": "
采用面向对象的决策树分类方法提取荒漠化信息，变化检测采用基于光谱特征相似度的变化监测方法。", "ds_quality": "
从所有提取的荒漠化图斑中随机抽取5%的样本，通过人工目视判读对图斑的荒漠化类型 进行逐斑核验，总体精度超过 95%。", "ds_acq_start_time": "1975-01-01 00:00:00", "ds_acq_end_time": "2024-12-31 00:00:00", "ds_acq_place": "奈曼，民勤，敦煌", "ds_acq_lon_east": 121.7, "ds_acq_lat_south": 38.4, "ds_acq_lon_west": 94.3, "ds_acq_lat_north": 43.8, "ds_acq_alt_low": null, "ds_acq_alt_high": null, "ds_share_type": "login-access", "ds_total_size": 39960317, "ds_files_count": 2, "ds_format": "shp", "ds_space_res": "30", "ds_time_res": "年", "ds_coordinate": "WGS84", "ds_projection": "Albers Equal Area Conic Projection System", "ds_thumbnail": "5b795411-df3a-46ae-8506-00dd5040b2e0.png", "ds_thumb_from": 2, "ds_ref_way": "", "paper_ref_way": "", "ds_ref_instruction": "", "ds_from_station": null, "organization_id": "6d0aa454-9b64-4be5-b0cd-4cc796e6aea0", "ds_serv_man": "李红星", "ds_serv_phone": "0931-4967592", "ds_serv_mail": "ncdc@lzb.ac.cn", "doi_value": "", "subject_codes": [ "170.4510" ], "quality_level": 3, "publish_time": "2026-03-13 19:11:14", "last_updated": "2026-03-13 19:11:14", "protected": false, "protected_to": "2028-03-13 00:00:00", "lang": "zh", "cstr": "11738.11.NCDC.DESERTIFICATION.DB7162.2026", "i18n": { "en": { "title": "Desertification Dataset of Typical Areas (Naiman, Minqin, Dunhuang) from 1975 to 2024", "ds_format": "shp", "ds_source": "
Using Landsat series satellite imagery as the data source, MSS imagery was used in 1975, TM imagery was used in 1990, 2000, and 2010, and OLI imagery was used in 2020 and 2024.", "ds_quality": "
Randomly select 5% of the extracted desertification patches and perform spot by spot verification of the desertification type through manual visual interpretation, with an overall accuracy of over 95%.", "ds_ref_way": "", "ds_abstract": "
This dataset is selected from the Landsat satellite orbit images of Naiman (P121R030), Dunhuang (P137R032), and Minqin (P131R033) counties, with a typical area of 125 * 125km2. Landsat series satellite images are used as the data source, and an object-oriented classification method combined with a 1:100000 scale mapping requirement is used to conduct thematic mapping of desertification in the six periods from 1975 to 2024. The data format is Shape file, and the projection system adopts ALBERS equal area projection based on WGS84 benchmark. The Classname field in the attribute table is the desertification code.", "ds_time_res": "年", "ds_acq_place": "Naiman, Minqin, Dunhuang", "ds_space_res": "30", "ds_projection": "Albers Equal Area Conic Projection System", "ds_process_way": "
Adopting an object-oriented decision tree classification method to extract desertification information, and using a change monitoring method based on spectral feature similarity for change detection.", "ds_ref_instruction": "" } }, "submit_center_id": "ncdc", "data_level": 0, "license_type": "CC BY 4.0", "doi_reg_from": "reg_local", "cstr_reg_from": "reg_local", "doi_not_reg_reason": null, "cstr_not_reg_reason": null, "ds_topic_tags": [ "荒漠化", "Landsat", "面向对象", "1975-2024" ], "ds_subject_tags": [ "自然地理学" ], "ds_class_tags": [], "ds_locus_tags": [ "中国", "奈曼", "民勤", "敦煌" ], "ds_time_tags": [ 1975, 1976, 1977, 1978, 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 ], "ds_contributors": [ { "true_name": "宋翔", "email": "songxiang@lzb.ac.cn", "work_for": "中国科学院大气物理研究所", "country": "中国" } ], "ds_meta_authors": [ { "true_name": "宋翔", "email": "songxiang@lzb.ac.cn", "work_for": "中国科学院大气物理研究所", "country": "中国" } ], "ds_managers": [ { "true_name": "宋翔", "email": "songxiang@lzb.ac.cn", "work_for": "中国科学院大气物理研究所", "country": "中国" } ], "category": "沙漠与荒漠化" }